Tubular structure and method of making same



Nov 7, 1933; v

TUBULAR STRUCTURE AND METHoboF MAKING SAME Filed May 8, 1929 /a fg lg 6 /2 /16 7@ v/ j Z m T. E. MURRAY 1,933,749

Patented Nov. 7, 1933 1,933,749 TUBULAB STRUCTURE .AND METHOD F' MAKING S Thomas E. Murray. Brooklyn, N; Y.;

Thomas E. Murray,

executors ofl asignar! York AME

Joseph Jr., and said Thomas E. to Metropolitan Company, a corporation o! New apposition my s, '1929. sei-n1 No. 361,529 4 claims. (ci. zs-iism 4 This invention relates to a tubular structure and a method of making the same and to aunion or tting ior joining and autogenously or hermetically sealing successive pipe or tubular lengths.

An object of the invention is to provide a tubu- V lar structure or piping in which successive pipe lengths are joined both mechanically and hermetically.

Another object of the invention is to provide a pipe union or fitting having extensions adapted to :dt a pipe or tubular member that may be threaded'into said union and capable of being welded or otherwise autogenously or hermetieally joined to said pipe or tubular member.

II such a system were formed by an autogenons welding ofthe pipe directly to the threaded portion oi a union, the heating and cooling incident to the welding operation would distort and impair the threads o1 the union and pipe.

The present invention, therefore, provides a method by which an autogenous joint or weld may be made between the union or iitng and the pipe blank iitted thereto without distorting or impairing the threads of theunion.

With these and other objects in view which will appear from the following description, the invention comprises the tubular structure and iitting described in the followingv speciiication and claims.

Various features of the invention are movin in the accompanying drawing in which Fig. 1 is a longitudinal sectional view of a portion o! the tubular structure and oi the union or coupling joining the two sections of pipe;

Fig. 2 is a similar longitudinal view of a tubular structure embodying a modiiled form oi coupling or union, and

Fig. 3 is a similar longitudinal sectional view of another modification of the union or ntung.

Referring more particularly toFig. 1, the tubular structure oi the present a, pair of pipe lengths and 11 having screw threaded ends threaded into a collar portion 12 of the union or fitting joining the adjacent ends of the pipe sections 10 and 11. The collar portion 12 is preferably made oi a relatively thick heavy cast or forged metal. Extending iromeaoh end oi the collar portion 12 are relatively thin tubular extensions 13 and 14, the outer surfaces of which form continuations of the surface of the collar 12. The extensions 13 and 14, are, however, thinner tban the collar portion 12 Iorminsthin annular spaceslandlateach 55 end of the collar 12.

invention comprises 'done in The free ends of the extensions 13 and 14 are turned inwardly at 1'?V and 18 to closely fit the outer surfaces of the pipe lengths 10 and 11. The inturned portions 1'1 and 18 serve to guide 10 and 11 as they are brought 60 and ensure ag t any crossing of the threads due to imperfect alignment. The extensions 13 and 14 also serve to stiien the joint against transverse stresses and thus remove considerable of these strees from the central collar portion 12 and from the threaded ends of the pipe lengths 10 and 11.

When a weld or hermetic seal is to be made between the pipe lengths sions 13 and 14,- the inturned parts 1'1 and 18 also provide a close contact suitable for receiving the weld.

In forming the fitting 1214, the central collar portion and the two extensions may be formed or forged in a single piece and then turned to the proper dimensions and threaded.

In the form of the invention shown in Fig. 2, the central collar portion 12 and the extensions 13 and 14 are formed separately and then joined 80 to an integral imit by butt-welding the ends of the extensions 13 and 14 to opposite ends ofthe collar l2 as at v19 and 20. This welding may be any suitable way as, for example, by electric butt-welding by the application of a. current o! extremely high amperage for a. very brief duration of time, asl described in Murray Reissue Patent 15,466 oi1922. In order to avoid any distortion oi the threads of the central collar portion 12, the welding is done before this por- 90 tion is threaded. Y

In the form shown in Fig. 3, the extensions 13 and 14 are butt-welded to the central collar portion 12 in a. manner similar to that in Fig. 2. The extensions 13 and 14 in this form of the 95 invention are, however, not provided with the intumed end portions 1'1 and 18 but are of smaller diameter than the central collar portion 12 and thus lie closely adjacent the pipe sections 10 and 11. In forming this ntting, asin the fitting of Fig. 2, the extension members 13 and 14 are iirst butt-welded to the central collar portion and the latter is then internally threaded to receive the threaded ends of the pipes 10 and 11. After the pipeesections 10 and 11 have been threaded 105 into the central collar vmember 12, the outer or tree ends o! the extensions are welded to the outer surfaces of the pipe lengths 10 and 11 at 21 and 22 by arc or acetylene welds.

Throughthe above invention, the pipes 10 and 110 10 and 11 and the exten- 70 formed greatly strengthened against lateral or bending stresses. The invention moreover provides means for additionally strengthening this union by autogenous welding without distorting or impairing the eifectiveness union.

What I claim is:

1. A coupling comprising a threaded collar and ular extensions welded to the end faces of are Weided to the section threaded into the collar.

2.' A continuous tubular structure comprising the extensions of said coupling being autogenously welded to the outer peripheral surfaces of the tubular sections.

3. The method of forming couplings of the type described and claimed in clalm 1 which com- 8 member and thereafter formingscrew threads on the internal face of said collar.

4. The method of forming a continuous tubular structure which ting ends of threaded tubular sections into a sions to the peripheral outer face of said tubular section.

THOMAS E. MURRAY. 

